Key-controlled, combination changing, permutation lock



June 22,- 1965 D. J. FOOTE ETAL KEY-CONTROLLED, COMBINATION CHANGING, PERMUTA'I'ION LOCK 4 Sheets-Sheet 1 Filed May 4. 1962 INVENTORS DANIEL JQFOOTE ALEX D. STAHL KENNETH H. BUGHMANN mmezmmaz ATTOR NEYS.

June 22, 1965 D. J. FOOTE ETAL KEY-CONTROLLED, COMBINATION CHANGING, PERMUTATION LOCK Filed May 4, 1962 4 Sheets-Sheet 2 June 22, 1965 D. J. FOOTE ETAL- 3,190,089

KEY-CONTROLLED, COMBINATION CHANGING, PERMUTATION LOCK SIIIII INVENTOZG DANIEL JPFOOTE ALEX D. STAHL rill/111111111111!!! l ATTORNEYS.

KENNETH H. BUCHMANN' J1me 1965 D. J. FOOTE ETAL 3,190,089-

KEY-CONTROLLED, COMBINATION CHANGING, PERMUTATION LOCK Filed May 4, 1962 V 4 Sheets-Shet 4 INVENTORJ DANIEL J. FOOTE ALEX D. STAHL KENNETH'H. BUCHMANN F Mala mm M KTTORNEYS.

United States Patent KEY-CONTROLLED, COMBINATION CHANGINS,

PERMUTATION LOCK Daniel J. Foote, Wauwatosa, Alex D. Stahl, Milwaukee, and Kenneth H. Buchmann, Menomonee Falls, Wis, assignors to Master Lock Company, Milwaukee, Wis., a corporation of Wisconsin Filed May 4, 1962, Ser. N0. 192,551 9 Claims. (Cl. 70--156) This invention relates to improvements in key-controlled, combination changing, permutation lock, and more particularly to a simplified dial and key-operated self-locking spring bolt permutation locker lock for use on box type lockers, drawers, cabinets or the like, which are devoid of automatic latching bars and handles.

Conventional permutation locker locks are normally installed in pro-punched holes in-standard, upright, sidechanging, and escutcheon assembly have been described in great detail in co-pending applications, Serial No. 10,760 filed February 24, 1960, now Patent No. 3,023,600, Serial No. 13,509 filed March 8, 1960, now Patent No. 3,031,876, Serial No. 15,196 filed March 15, 1960, now Patent No. 3,031,877, and Serial No. 21,306 filed April 11,1960, now Patent No. 3,023,602.

The aforementioned permutation locks are installed on a group or series of handle-type, upright lockers, or the like, having automatic latching bars and rod release in schools or factories where students, teachers, or employees hang up or leave their clothes, coats, books, tools, or other personal belongings. user can have access to and open his own locker by dialing a pre-assigned combination, while the school principal, custodian, plant foreman or other authorized person may also open each lock in the group or installation by using a control or master key that will operate the key control mechanism in all of said locks without dialing each lock. Further, for protection purposes, the combination on each lock may subsequently be changed by a combination changing means or device, at the end of every term, year, or whenever desired as students or employees graduate or leave.

However, in many gym locker rooms and athletic, departments of schools, colleges, clubs, bowling alleys, factories, and various public buildings, square or small sized box or compartment type lockers are used instead of the standard, elongated, upright, single or double tier lockers. in multiple tiers and in adjacent rows, to conserve space and for the storage of gym or athletic equipment and other personal belongings. Since these standard box lockers are devoid of automatic latching bars and rod act as the latching device and the lock knob serving as the handle to open the locker door. Therefore, to be efiective, the spring bolt lock so utilized must operate in a difierent manner and move horizontally under tension Each student or individual These box lockers are set on top of one another,

Patented June 22, 1965 into and out of the lock case and thus eliminate the need for an automatic latching bar or rod release.

At the same time, it is most desirable that this spring bolt lock be either dial or key operated and still be subject to having its combination changed easily by a push button mechanism.

With the foregoing in mind it is, therefore, a general object of this invention to provide an improved keycontrolled permutation locker lock of the self-locking, dial and key-operated spring bolt type having a novel internal locking mechanism of simplified yet sturdy construction, and which is easy to operate.

Another object of the invention is to provide a new and improved key-controlled permutation lock of the spring bolt type for use on lockers and the like whereby the bolt under spring tension may be directly operated manually by dialing alone or by means of a control key only.

A further object of this invention is to provide a combination lock with tumbler disc and combination mechanisms effective to operate a spring bolt or latch member through dialing or by a key control or cylinder mechanism in the knob and escutcheon assembly which, by use of the proper control key, can actuate such spring bolt to open the lock, independently of operating the dialing mechanism.

A still further object of the'invention is to provide in a key-controlled permutation lock of the class described a novel spring bolt actuating mechanism housed in the lock case whereby said bolt can be actuated or moved ('by dialing or by use of a control key) horizontally, in either direction, depending on whether it is desired to open or close said lock or the locker 'dcor.

Another object of the invention is to provide, in a keycontrolled, spring bolt permutation lock for lockers and the like, a push button operated mechanism for changing the lock combination together with theuse of the proper control key turned to a stop position beyond its normal unlocking position, whereby the combination may be easily changed to different assigned combinations, when desired, without loosening or disassembling the'lock or using any special reset key or special tools to release and a reset the knob ordiscs, and thus providing a safeguard against unauthorized combination changing.

A still further object of this invention is to provide in a key-controlled permutation locker lock a spring bolt member and an improved and novel automatic upset mechanism whereby, when dialing manually, the combination will be upset or disturbed automatically after the-spring bolt is retracted, the door is opened, and the operators hand is removed from knob.

A further object of the invention is to provide a novel key-controlled, spring bolt permutation lock which incorporates a combination changing mechanism subject to being changed by a push button mechanism,-especially adapted for box lockers and the like, which is of simple and durable construction, is easy to assemble, mount, and operate, is compact and attractive, and is well adapted for the purposes described.

With the foregoing and other objects in view, the inventlon consists of the improved key-controlled combmation changing self-locking spring bolt permutation lock, and its parts and combinations, as set forth in the claims, and all equivalents thereof.

In the accompanying drawings in which the same reference characters indicate the same parts in all of the views:

FIG. 1 is a fragmentary front view, on a reduced scale, of one of the box lockers of a tier or group in which the locker door front is equipped with the improved key-controlled combination-changing. permutation lock; 4

7 approximately along the line 22 of FIG. 1;

i .the upset lever;

the drive lever spring; and

FIG. 2 is a fragmentary transverse sectional view-taken FIG. 3 is an enlarged vertical sectional view through tation lock installed therein and fu r ther disclosing the relationship of the drive lever andu'psetflever to the leverretaining plate and the bottom plate and including the V a portion .of a locker door showing the improved perinudialing and key-control mechanisms, "said view being taken approximately along the line 33 of FIG. 4; a

FIG. 4 is a sectional viewtaken approximately along the line 4-4hof FIG. 5 showing in elevation the relationship of the drive lever, drive lever spring, and drive lever plate, said'view also showing the box locker door and the relationship of the spring bolt of the mounted lock to the door jamb;

FIG. 5 is a sectional view taken approximately along 'the line 5-5' of FIG. 4 of the portions, including-the clutch spring and clutch, removed to show the opening J;

and upsetting mechanism within the lock case in the' condition in which they are when the locker door is locked and the permutation mechanism is upset; FIG; 6 is a similar sectional view only showing the drive lever entered into the gates of the tumbler discs 4 7 cable to drawers, cabinets and the like, which, as'well as the box lockers, are devoid of automatic latching bars and handles.- 7

As will best appear froin'FIGS. 2 and 4, the jamb 29 of a locker or the like, adjacent the swinging edge. of the hingedly-mounted door 3 1, is provided with an inwardly directed channel 32 to receive the inturned'flange. 33 on the free, vertical edge of the door 31, The innermost wall of the. jamb defining the channel 32 is formed with an opening 34 to receive a spring-urged, beveled locking bolt 35 which forms part of the improved lock mechanism and-which, through the mechanism later to be described,

is adapted to yieldingly reciprocate into and out of the. opening 34 at right angles to the plane of the channel wall containing the opening 34.

One sub-assembly of the improved permutation lock,. which ismounted on an outer face portion of the box 7 locker door 31 adjacent its free edge and which is ,sub-' stantially similar to the sub-assembly of the lock on the exterior of the door shown in United States Patent N0. 7 3,031,877, includes 'a combined dial and knob 36, a keyreceiving pin tumbler locking cylinder 37, together with means for-holding the cylinder 37'against rotation, the

and the bolt retracted into the lock case resulting froma] correctly dialedand opening operation of the lock, said view also illustrating the entry of the hook and upset'lever i into special notches on the tumbler discs preparatory to revolving them for upsetting purposes on the forward or locking movement of the bolt and lever-retainer plate;

FIG. 7 is a similar sectional view only showing the cam turned somewhat in a' clockwise direction and hearing against the bolt to retract the bolt into the lock case as occurs when the lock is operated by a control key;

FIG. 8 is a similar sectional view only showing 'the camfurther revolved in a clockwise direction to clear a protuberance on the bottom plate which condition attains 7 when the control key is manipulated'for combination-' changing purposes;

FIGS. 9 and 1 10 are face and edge views respectively of the bottom plate ofthe lock mechanism; 7

FIGS. 11 and 12 are face and edge views respectively of the lever-retaining plate; V r V V FIGS; 13 and 14 are face and edge views respectively of the lock bolt; 7

FIGS. 15 and 16 are-face and .edge views respectively of an inncr tumbl er disc;

latter. comprising a cylinder-retaining plate 38 formed with a pair of forwardly-directed spaced-apart arms 39 which straddle a cylinderishell-flange to thereby prevent rotation of the cylinder when the dial knob is turned.

The cylinder-retaining plate 38 is connected to the cylindricai portion of a tumbler disc shaft'or 'post 41. Said exterior sub-assembly furthermore includes a notchededge disc driving plate 42 which can be pre-arranged in. *a variety of circularly advanced positions so that a selected pair of diametrically-opposed notches therein will. V engage a'pair'of diametrically-opposedsemi-circular lugs formed on aring' surrounding the opening in the inner end of the ,knob and dial assembly, all as was disclosed.

in said Stahl et a1. U.S.-Patent'No. 3,023,600. Also, the

notched plate 42, which has a central circular opening therein, has ad acent a marginal portion of said circular opening integral'fingers (see FIG. '3) at right angles to the plane of the combination-setting plate and which areadapted 'to register with slots 85 therefor in the hub portion '46 of a clutch plate 46 formed with a series of FIGS. 17 and .18 are top and side views respectively of i .an operating cam;

FIGS. 19 and 20 are top and side views respectively of the drive lever;

FIGS. 21 and 22 are top and side viewsrespeetivelytof FIGS. 23. and :24 are side and top Views respectively of FIGS.,25 and 26 are top and side views respectively of the upset lever spring. a

While the improved key controlled, combination changing permutationlockis susceptible of broader application,

. in'the present embodiment the'locks are incorporated in the hinged doors 31 of a series of identical box-type lockers 30 (see FIG. 1) which are mountedron top of one-another in multiple tiers and adjacent rows.

Insofar .as theprinciples 'of the present invention are concerned,

the direction'of openingof thelocker doors, and the consequent positioning and'dire'ction'of the locks applied thereto, 'arejimmaterial. .In' FIGS. 11" and 2 the locker" doors 31 areof the type which are hinged along their. Qright-hand margins and the locks are applied to the opposite margins of the' door. However, the locks could be' applied to locker, doors which open in a reverse directidn 'and, in this event, the lockbolts and mechanisms are' reversediover that shown in the drawings, .Also, while. the permutation locks areillustrated as being'applied to fthe'doors of box-type lockers, the same are equally applit 5 1 thei keyway 0t fll P 'arcuately spaced-apart and staggered openingstherein.

' It will thus beseenithat manual rotation of the dial. knob'36 is effectiveythroughfthe. plate 42 carried fast therebyin a predetermined position, to turn'the circular clutch plate 46, the latter being positively engaged by the fingers on the notched plate 42. V

plate143 which carriesa decorative overlay and which a cover and renders inaccessible the heads of'certain securingbolts 44. (see FIG, 3), i Y ,7

Similarly to the arrangement disclosed in a recess 48 therefor in thefront'wall of the dial knob,

the front wall of the dial knob having an opening therein .which registers with the front end of the plug and pro- -vides access for the insertion As. willbe obvious from the The combined knob and dial 36 -is mounted in z the; 'manner-shown and described in the Stahle't' a1. United States Patent No. 3,023,600 and includes 'anescutcheon I v the Footeand Buller US. Patent No; 3,03 1,876,Lthere is incorporated within the dialing knob 36'the previously mentioned pin .tumbler cylinder 37 and the cylinder-retaining plate, in addition to a plug'47. Said plugis rotatable within the cylinder .37 and extends at its forward end portion into 1 ofa master key 49 into 7 features of the present invention reside in the internal sub-assembly which is housed within the case 50.

The improved lock bolt 35 is shown in detail in FIGS. 13 and 14 and it will be observed that it is U-shaped in side elevation and of integral formation, being a one-piece metal stamping with the extremity of one arm portion carrying the beveled head portion to cam or ride on the locker jamb. The flat base portion of the lock bolt 35 is provided with an opening 52 therein and the end portion of the arm opposite the beveled portion carries a lug 53 to receive a coiled spring 55 (see FIG. 4), whose other extremity bears against an inner wall portion of the casing. The U-shaped formation of the lock bolt permits other internal mechanism of the internal assembly to seat therein and the flat base portion of the lock bolt is slidably accommodated by a groove or offset 54 in the rear wall of the casing 50. Nested within the U-shaped portion of the lock bolt 35 with an interposed washer 57 is a combined key control cam and combination-changing button 56, shown in detail in FIGS. 17 and 18, wherein its button portion 56 projects rearwardly through the opening 52 in the base portion of the lock bolt 35 and through an opening 58 provided therefor in the rear wall of the casing 50. The inner end portion of a plug extension 59 is secured fast to the button portion 56 of the member 56 and said plug extension extends forwardly axially of the casing 50 in a manner so that the semicylindrical forward end of the plug extension 59 is engageable with a similar mating portion on the plug 47. Inwardly of the cam 56 there is mounted a bottom plate 69, shown in detail in FIGS. 9 and 10, Whose mid portion is offset forwardly and apertured and slotted for engagement with the inner end portion of the tumbler disc shaft or post 41.

As will best appear from FIGS. 3 and 4, an intermediate portion of the tumbler disc shaft or post 41 revolubly carries a plurality of tumbler discs 61 and 61' with inter posed non-rotating collars 62. An inner tumbler disc 61' is shown in detail in FIGS. and 16, and it will be observed that each of said tumbler discs 61, as well as the outer tumbler disc 61, is formed with a peripheral gate 63. However, on the two innermost tumbler discs 61', substantially diametrically opposite the gates, the disc peripheries are formed with obliquely angled notches 64 so as to cam out the nose portion'of a drive lever 65 (FIGS. 4, 5, l9 and as the lock bolt is projected to the forward position of FIG. 4. With the angled notches 64 on the remote sides of said tumbler discs 61, when the drive lever 65 retracts the lock bolt, as will hereinafter appear, said lever will remain enmeshed with the gates of all of said tumbler discs. Thus all discs are engaged or disengaged at the same time. However, the forward tumbler disc'61 is arranged on the post with its gate 63 in a position of clockwise advancement relative to the position of the gates of the discs 61'. Consequently, the nosed end of the drive lever 65 becomes interlocked with the gate of said tumbler disc 61 by force resulting from rotation of the dial when the lock is being released. The inner end portion of the drive lever 65 is pivotally mounted, as at 66, on a face portion of a lever retaining plate 67, shown in detail in FIGS. 11 and 12. The drive lever 65 is yieldingly urged into engagement with peripheral portions of the discs 61 and 61' by a spring 68, shown in detail in FIGS. 23 and 24, which is confined between w an inner wall portion of the case 50 and an edge portion of the drive lever 65.

The previously mentioned lever retaining plate 67 is shaped and constructed as shown in detail in FIGS. 11 and 12,- having therein an ovate central opening'69, a

notch 70 in the curved peripheral portion thereof and an outwardly bent finger 71 adjacent its forward edge. Also, there are a pair of relatively small apertures 72 in the plate, one of which is utilized for the pivot post 66 for the drive lever 65. The other aperture .72 receives a pivot post 73 for pivotally mounting an upset lever 74, shown in detail in FIGS. 21 and 22 and shaped as illustrated therein. The outwardly bent finger 71, adjacent the forward edge of the plate, serves as a stop to limit or restrict pivotal movement of the upset lever 74 in one direction and to prevent the upset lever from contacting or binding on the tumbler discs 61-61 when the lock is engaged.

The drive lever 65, in its mounted position, has its inner, pivotally mounted end adjacent the side wall of the casing 50 remote from the bolt 35. The'manner in which the drive lever is mounted and located insures contact of the drive lever with the tumbler discs during retraction of the yieldingly mounted lever retaining plate 67 and bolt 35 during the opening operation of the lock and, furthermore, resists such radial forces as would normally tend to disengage it. The outermost tumbler disc 61, when in peripheral contact with the nose end of the drive lever relative to the abutment side of its gate 63, engages a notch or detent 75 in the nose end of the lever 65 and thereby holds said lever 65 in contact with said tumbler disc by the rolling action of the disc, forcing the nose .portion of said lever 65 downwardly into tighter engagement with the disc.

The previously mentioned upset lever 74, which is pivotally mounted on the lever retaining plate 67, and which is under the force of a spring 76, has an edge portion adjacent the disc formed with a shoulder 77 for pawl and ratchet-like engagement with one of the Peripheral notches 64 in a tumbler disc 61 when the condition shown in FIG. 6 attains and the lever retaining plate 67 is in its retracted position. lhe forward extremity of the upset lever 74 is adapted to engage the outwardly bent finger 71 on the lever retaining plate to limit the movement of said upset lever toward the tumbler disc, as previously mentioned.

The cam portion of the member 56, previously mentioned, is generally in the form of an arrowhead (see FIG. 17) and is formed with surface dimples or dents 78 to give safety clearance to certain clutch pins when in locked position. These clutch pins 79 are axially, movably mounted similarly to the clutch pins shown in the Foote and Arnold Patent No. 3,031,877, and the inner ends thereof are in surface engagement with portions of the key control cam member 56. The forward end portions of said pins 79 bear against the clutch plate 46 to shift the same axially forwardly in the casing 50 (see FIG. 3) when the button portion 56' of the member 56 is pressed inwardly.

Although the complete operation of the lock will be described more in detail hereinafter, at this point it may be stated that when the master control key 49 is inserted into the slotted plug 47 and turned, through the engagement between the inner end of the plug 47 and the plug extension 59, the combined key control cam and combination changing cam 56 will be turned to remove the high side of the cam from a protuberance 80 on the bottom plate 60 (see FIG. 3). Then the cam 56 may be pushed forwardly axially by pressure on the externally protruding cam button 56'. This inward movement of the cam is transferred to the disc clutch plate 46 by the axially moving pins 79. Thus, the clutch plate 46 is removed from engagement with the forward'tumbler disc 61 so that a new combination for the permutation mechanism may be selected. As will be evident, the clutch plate 46 is formed similarly to the clutch plate shown in FIGS. 10 and 11 of the Foote and Arnold US. Patent No. 3,031,877

and includes in its peripheral portion a pluarlity of varithe clutch'plate and the forward tumbler disc 61. It may .also be stated that said cover plate is a blanked and punched element with a' central aperture through Whlch s a es-o thereof. The outermosttumbler disc 61 does not at this time have this obliquely slanted edge of its gate presented to the drive lever nose 6 5. Hence,.the disc 61 will be passthe interconnecting splines of the internal and ex- .ternal assemblies of the lock. I

Operation bf spring bc-lt combination lock by dialing the I correct combination 1 With reference to FIGS. 3 and 60f the drawings, operation of the permutation mechanism to open the lock is.

mounted on the lever retainer plate 67, is urged by the spring 68 into the opening created by the registering tumbler disc gates. Further rotation of the dialing knob 36 in a clockwise direction relative to FIG. 4 willfcause a peripheral portion of the. outermost tumbler disc 61.to bear against the nose of the drive lever 65 and urge said lever laterally, which lateral movement is transferred, by the pivot post '66, to the lever retaining plate 67.- Additionally, this lateral movement is transferred from the lever retainer plate 67 to the lock bolt 35 by contact between the inner end of the lever retaining plate and an end flange 84 'on the innermost leg portion of the lock bolt in opposition to the force of the spring 55. In this manner the beveled outer end of the lock .bolt 35 will be withdrawnthrough the slot which accommodates it into v the lock case 50, clearing the bolt oil-engagement with caused to revolve inacounter-clockwise direction by the action of the drive lever on its periphery and this revolving action continues until the drive lever cams'out of the V gate63 andcan no longer overcome the resistance'ofthe turning movement ofthe outermost disc 61, whereupon the noseportion of the drive lever'rides on the periphery of all of thetumbler discs. We have heretofore seenthat the outermost tumbler disc .61 'connectedto thendialing knob assembly 36 will, by'the last-mentionedrevolving 'action of the disc 61 by the drive lever 65, automatically. turn or revolve the dialing knob, 36 completely away, from the last combination number with which it was reg-.

istered. This is extremely important because, when the 1 lock has been released or opened through the permutation mechanism and the dialing knob is released, the discs will be completely upset and the dial markings will bere: moved from registration to prevent detection of any of the setting points. As was seen, the outermosttumbler disc the door jamb, whereby the locker door is unlocked'and released.

Concurrently with the lock bolt retracting action described, the upset lever. 74, which is pivotally mounted .on the post 73 on the lever retaining plate 67 andyield- .ingly urged toward the tumbler discs 61 and 61 by the upset lever spring .76, but restrained'by. the outwardly bent finger 71, and which lever normally minutely clears the periphery of the tumbler discs, is then brought into contact with the periphery of the tumblerdiscs by the lateral movement previously mentioned. When the bolt .35 starts its fully retracted position within the lock case 61 is revolved in one direction while the inner discs 61 are revolved in an opposite direction, which accomplishes the upset with relation to the alignment of the tumbler A complete redialing of the combination is disc gates. therefore necessary to bring the'tumbler discs into such mutual alignment as'will permit the lock to be opened.

Operation 0 the lock by using the control key This type of operation will be described particularly with referencetoFIGS. 3 and 7 of the drawings. The master control key 49 is, of course, inserted into its slot or key-way in the plug 47fand theoperation of the lock plug proceeds in a manner well understood in the art. It may be stated, however, that in the present embodiment,

the key is turned oneequarter of. a revolution, in a clockwise direction relative to FIG. 4, this motion is trans- 'mitted to the plug extension59 and from thence to the key control cam 56 in the manner explained-in the Foote and Arnold Patent No. 3,031,877. The cam 56 in the locked condition of themechanism (see FIGS. 5 and 6),-

- normally presents its low side to the flanged end 84 of 5d, the upset lever 74, which has been urged against the periphery of one or more of the tumbler discs, then pivots in a clockwise'direction relative to FIGS. 5, 6, 7 and 8 7 so that its shouldered end portion 77 enters one of the disc angled ratchet notches 64. e V

When the operator releases his grasp on the dialing knob 36, after accomplishing the unlocking operation, the.

.binding action of the drive lever- 65 is relieved relative to the tumbler discs 61 and .61 and the lever retaining plate 67. The resilient action of the bolt spring 55 then' the lock bolt 35. 'However,.when the cam is turned a quarter of a revolution in a clockwise direction through the operation of the cylinder plug, said cam gradually presents its higher side to the bolt flange S4 and thereby retracts said bolt head into the lock case 50- and cornpr'esses the spring 55. Naturally, said bolt, when retract-1 inginto the case, carries with it the lever retaining plate 67, which it engagingly straddles, together With the drive 7 lever 65,"drive lever spring 68, upsetflever 74 and upset shifts bolt 35 in a direction so that the angularly directed 7 end flange 84 of the bolt acting against the adjacent. end

' portion of the lever retaining plate67 advances the same toward the left, relative to FIGS. 5, 6, 7 .and 8, together with the drive lever 65 and the upset lever 74 carried thereby. I The lever 74, however, is in hooked engagement with one of the disc notches 64 and thereby causes the V tumbler discs to revolve in a clockwisedirection'relative to the drawings and this turning movement of the disc continues until the shouldered portion 77 of the upset:

lever clears the last of the series of disc ratchet notches 64, during whichtirne the head of thelock' bolt 35 has returned to its projected'position of FIGS. 4, 5 and 8. The V movenientto the left of the lever. retainer plate 67, carry-p ing' with it the drive lever 65. and the upset lever 74, causes 1 'the-drivelever to be cammed out of the tumbler disc gates 63 byriding outwardly on theobliquely inclined edges 7 lever spring 76. Duringthis movement the drive lever and upsetlever perform no functions because the tumbler discs are indisarranged or 'upset condition and the nose ends of said levers merely slide overthe peripheries of the 7 discs as they are carried along by the movementof the lever retaining plate. When the control key 49 is turned a quarter revolutioncounterclockwise, back tov its original position, the expansive force of the spring returns the bolt 35 to its initial projection position, causingthe lever retaining plate 67and the various partsmounted thereon V to reciprocate toward the left relative to FIGS. 5, '6, 7 and 8. V e

Itshould also be statedat this: point that the headof thebolt 35 can be retracted into the lock case SO-by'a pushing action exerted directly thereon, which retraction of the lockbolt willcompress the spring 55. When push ing pressureon the bolt head is released it wilLbe automaticallyreturned'to its projected position, withoutdisturbing any of the mechanism'of thelock, due to'the ex-r 'pansive force exertedon the; bolt flange 84 by the spring 55. This islan action which occurs' when a door mother 5 "member on which the lock is installed is closed with the bjolt being pressed or retracted into the lock caseby the door jamb or striker plate. Because the bolt returnsto 9 its projected position behind the jamb, it is self-latching and is, therefore, highly advantageous when installed on box-type lockers and the like which are devoid of incorporated latching bars and the like.

Operation of changing the combination of the lock by turning the control key door, the key should be turned through an additional angle of approximately one-eighth of a revolution in a clockwise direction to a stop position. Said additional turn of the key imparts an additional turning movement in the same direction to the plug extension 59 and the key control cam 56. The latter in all of its positions previously referred to was blocked from inward axial movement by engagement with the protuberance 80 on the rear face of the bottom plate 60. However, the additional turning movement imparted to the control cam 56 causes the cam to clear the protuberance 80 so that the cam 56, plug extension 59 and other parts are free to be moved axially inwardly. The latter is accomplished by a forceful manual pressure on the button portion 56' of the control cam 56 and such inward pressure causes the cam to react against the pins 79 which are projected axially forwardly in slots therefor in the tumbler disc post. The inner ends of said pins 79 react against the inner face of the clutch plate 46 and shift the clutch plate out of engagement with the forward tumbler disc 61. A slight manual turning movement imparted to the dialing knob 36 at this time then places the combination numbers or delineations on the knob and dial in a new relationship relative to the gates on the tumbler discs 61 and 61', all as is set forth in the Foote and Arnold Patent No. 3,031,877.

trol cam 56 is thereby forced back to its normal position of FIG. 3 with the button'56 in its normal rearwardly protruding position. Thereafter the control key 49 is turned in a counter-clockwise direction relative to the drawings, back to its normal position of FIG. 3, and said counter-clockwise movement transmitted to the cam 56 through the plug extension 59 will reposition the high portion of the cam 56 behind the bottom plate protuberance 80, preventing forward axial movement of the cam, clutch pins and other associated parts. FIGS. 3 and 8 of the drawings may be specifically referred to in connection with the combination changing operations indicated above. If the control key 49 is finally completely removed from the key-way of the plug extension, the lock is in condition to be operated by the permutation mechanism by dialing in the manner heretofore described, but through dialing a new combination or set of dialing reference points. Of course, at anytime the permutati-on mechanism may be by-passed and the locklmay be opened by inserting and using the control key as heretofore described. The push button 56, which must be pressed in order to permit the attainment of acombina tion change, is inaccessible to tamperers except when the lock-equipped door is opened to thus expose the button 56' on the rear wall of the lock case.- p

Although the lock mechanism is a master key controlled permutation lock and is, therefore, suceptible to being" opened through the dialing of the correct combination or through the use of a master key, it incorporates a simple push button mechanism accessible only when the locked door is opened, which permits the lock combination to be changed without errors in an easy and rapid manner and without the use of special tools. It should further be observed that when the lock is opened through the use of a control key it is only necessary to turn the key through a quarter of a revolution and at this point a slight stop or resistance is encountered so that the operator'will know by the feel that the key has been turned sufficiently far to accomplish the unlocking function. if it is desired to change or alter the combination for the permutation mechanism, after the key has been turned through the quarter revolution to a click stop it is then manually turned an additional approximate one-eighth revolution to a firm stop beyond the click position, whereupon the push button mechanism may be operated to initiate the combination changing operation. There can be no accidental disturbance of the push button mechanism when the key is turn-ed only through the one-quarter turn for door opening purposes. When the improved lock is dialed manually the combination is automatically upset or disturbed after the spring bolt has been retracted and the door opened merely by releasing the dialing knob, permitting the spring bolt to be projected. In this condition the locker door may be closed and is consequently self-locking or latching in addition to the combination upset feature.

The improved key controlled combination changing permutation lock is especially suited to use in connection with box-type lockers, drawers, cabinets or the like which 7 are devoid of automatic latching bars or handles. The lock, however, is easy to operate, incorporates strong, durable and efficiently operating mechanism, may be easily operated or handled by an unskilled person, and is well adapted for the purposes described.

What is claimed 'as the invention is:

1. A combination lock comprising, a lock casing having an opening therein, a lock bolt reciprocally mounted through the casing opening and having an integral shouldered portion extended into the casing, a spring reacting against the shouldered extension of the lock bolt to yieldingly urge it toward its projected position, a plurality of superimposed tumbler discs rotatably mounted within the casing and formed with registering gates and notched peripheral portions, means including a knob for turning said discs to a predetermined position wherein their gates are in registration, a lever retaining plate carried by the extended portion of the lock bolt to yieldingly reciprocate therewith, a spring biased drive lever pivotally mounted on said lever retaining plate and having a nose portion engageable with the gates of the tumbler discs when the latter are in a predetermined position of registration, a spring biased upset lever also pivot-ally mounted on the lever retaining plate and having a poitionengageable with the :tumbler disc notches to turn and upset the same when the bolt is moved from its retracted to its extended position, a key-receiving cylinder plug independently rotatably housed within said knob and turna'ole upon the insertion therein of a proper key, nd a cam within the casing and connected to the cylinder plug to turn there with and engageable with a shouldered portion of the look bolt extension to reciprocate the bolt to a retracted position when the plug is turned through an inserted key.

2. A combination lock comprising, a lock casing having an opening therein, a lock 'bolt reciprocally mounted through the casing opening and having a dished =and shouldered portion extended into the casing, a spring rreacting against the shouldered extension of the lock bolt to yieldingly :urge it toward its projected position, a plural'ity of superimposed Itumbler discs'rota-ta-bly mounted within the casing and formed with registering gates and notched peripheral portions, means including a knob for .turning said discs to a predetermined. position wherein their gates are in registration, a lever retaining plate nested within the dished extension of the lock bolt to yieldingly reciprocate therewith, -a spring biased drive lever pivot-' tion engageable with the tumbler disc notches to turn and upset the same when the bolt is moved from its retracted to its extended position and the lever retaining platereciprocates therewith, a key-receiving cylinderplug independently r-otatably housed within said knob and turn i able upon the insertion therein of a proper key, and a cam wit-hinthe casing and connect-ed to the cylinder plug to turn therewith and engageable with a shouldered por-.

tion of, the bolt extension to reciprocate the bolt tofa retract-ed positionwhen the plug is turned through a pre-' 'determined angle by an inserted key. r

3. A combination lock comprising, a lock casing having an opening therein, a lock bolt unit including a bevelled head extending through the casing opening and a dished and shouldered extension within the casing and laterally reciprocally movable therein, a spring reacting against the extension ofthe lock bolt to yieldingly urge its a toward its projected position, a plurality of superimposed .co-axial tumbler discs rotatably mounted within the cas ing and formed with registering gates and notched peripheral portions remote from the gates, means including a knob for turning'said'discs to a predetermined position -Wherein their gates are in registration, a lever retaining plate nested within the dished extension of the lock bolt to reciprocate therewith, the axis of the tumbler discs being perpendicular to the plane of movement of the lock bolt, a spring biased drive lever pivotally mounted on an inner end portion of said lever retaining plate and having 7 a nose portion engageable'with the gates of the tumbler discs when the latter are in a predetermined position of registration, a spring biased "upset lever' also pivotally -mounted on an inner end portion of the lever retaining plate and having a portion 'engageable with the tumbler -disc notches to turn and upset the same when the boltis 5 moved from its retracted to its extended position, as key 7 -receiving cylinder plug independently rotatably housed within said knob andextending into'the casing and turn able upon theinsertion-therein of a proper key,and a 'member within the casing and connected with the cylinder 'plug who turned thereby and engageable withia shouldered portion of the bolt extension to reciprocate thef bolt to a retracted unlocking position independently of ,7

5 connected withthe push button mechanism, the cylinder the disc operation when the plug is turned through a predetermined angle by an inserted key.

4. A combination lock comprising, a lock casing having an opening therein, a lock bolt reciprocally mounted through the casing opening and having a' dished and shouldered portion extended into the'casing, a spring re-'- acting against the shouldered extension ofthe lock bolt toyieldingly urge it toward itsprojected positionpa plurality of superimposed 'tumblerdiscs rotatably mounted 1 -'within the casing and formed with registering gates, tum

bler discs other than the outermost disc being formed with notched peripheral portions substantially diametrically opposite their gates, means including a knob for turning said discs to a predetermined position wherein their gates are in registration, a lever retaining plate nested within the dished extension of the lock bolt to yieldingly recipro 'cate therewith, a spring biased drive lever pivotally mounted on said lever retaining'plate'and'having a nose portion engageable with the gates ofthe tumbler discs -wh'en the latter: are in a predetermined position of registration, a spring biased upset lever pivotally mounted on another portionof the lever r'etainin'g plate and having a portion engageable withthe tumbler disc notches to turn and upset the same when the bolt isiyieldingly returned a 'from its retracted to its extended positionandgthe lever retaining plate reiciprocatestherewith, a key-receiving stances l2 7 cylinder plug independently rotatably housed within. said knob and turnable upon the insertion therein of a proper key, and a cam within the casing and connected to the cylinder plug to turn therewith and engageable with ,a shouldered portion of the'bolt extension to reciprocate the bolt to a retractedaposition when the plug is turned througha predetermined angle by an inserted key.

5. A combination lock comprising, a lock casing have ing an opening therein, a lock bolt units including a 10 bevelled head extending through the casing opening and 1 a dished and shouldered extension within the casing and laterally reciprocally movable therein, a spring reacting against the extension of theilock bolt to yieldingly urge it discs being perpendicular to the plane of movement of the lock bolt, a spring biased drive lever pivotally mounted on one end portion of said lever retaining plate and having a nose portion engageable withthe gates of the tumbler discs when the latter are in a predetermined position of registration and have been turned in one direction to retract the lock bolt, aspring biased upset lever also pivotally mounted on another'portion of the lever retaining plate and having a portion enagageable with thetumbler disc notches to turn the same in an opposite direction and upset the discs when the bolt is moved from its reextending into the casing and turnable upon the insertion. therein ofia proper key, and means within the casing connected to and operated by the cylinder plug to reciprocate. the bolt to a retracted unlocking position independently of the disc operation WhClIl the plug is turned through'an in serte d key. a i

6. In a master key controlled,,combination changing.

' permutation lock having a spring lock bolt, the retraction v of whichis dependent upon key-actuated mechanism or per-, 'mutation mechanism, there also being normally locked 1 push button-operated mechanism operative .to permit" combination changing, the. improvements ,whichrcom prise: akey -receiving cylinder plug operatively connected with the bolt retracting mechanism and also operatively plug being turnable through a portion of, a revolution :by

button operated mechanism. a

controlling mechanism therewithin, permutation mechanism within the casing responsive to a pre-selected com-v bination foroperating the 'lockbolt controlling mechanism, a turnable dialing knob assembly extending'exteri: ally of one side of the casing for operating said permu tation mechanism, a key-operated plug operatively carried anis m{said combination changingmechanism havinga 7 normal inoperative position and a shifted combination altering position, permanently attached, manually operated means remote from said. dialing knob for shifting said V mechanism to its combination altering position, and means lock bolt to reciprocate therewith, the axis of the tumbler a proper key applied thereto to operate the bolt-retracting mechanism, and the cylinder plug being turnable through a greater portion of a revolution by said proper key' ap-p 55 plied thereto to'unlock and permit operation of the push' by said dialing knob assembly in coaxial relation and extending to. the lock bolt controlling mechanismto operate the same when turned through'a first limited arc of move-'- ment; combinationchanging mechanism within the cas-i ing and operatively associated with the permutation mech-- i-normally blocking movement-pf said mechanism shifting ,75 means but releasable upon'key turned operation ofsaid plug substantially beyond the first-mentioned arc of movement.

8. A combination lock comprising, a lock casing having an opening therein, a lock bolt reciprocally mounted through the casing opening and having an extension portion within the casing, a spring reacting against the extension portion of the lock bolt to yieldingly urge it toward its projected position, a plurality of superimposed tumbler discs rotatably mounted within the casing and formed with registering gates having obliquely inclined edge portions, tumbler discs other than the outermost disc being formed with notched peripheral portions substantially diametrically opposite their gates and the outermost disc being positioned so that its gate is reversed relative to the gates of the other discs, means including a knob for turning said discs to a predetermined position wherein their gates are in registration, a lever retaining plate connected to the lock bolt extension to reciprocate therewith, a spring biased drive lever pivotally mounted on said lever retaining plate and having a nose portion engageable with the gates of the tumbler discs when the latter are in a predetermined position of registration and adapted to be cammed therefrom when the discs are moved in an upsetting direction, and a spring biased upset leverpivotally mounted on another portion of the lever retaining plate and having a portion engageable, with the tumbler disc notches to turn and upset the discs and cam the drive lever out of the disc gates when the bolt is yieldingly returned from its retracted to its extended position and thereby moves the lever retaining plate.

9. A combination lock comprising, a lock casing having an opening therein, a lock bolt reciprocally mounted through the casing opening and having an integral portion extended into the casing, a spring reacting against a portion of the lock bolt to yieldingly urge it toward its projected position, a plurality of supermiposed tumbler discs rotatably mounted within the casing and formed with registering gates, certain of the discs having notched peripheral portions, means including a knob for turning said discs to a predetermined position wherein their gates are in registration, a lever retaining plate carried by the extended portion of the lock bolt to yieldingly reciprocate therewith, a spring biased drive lever pivotally mounted on said lever retaining plate and having a portion engageable with the gates of the tumbler discs when the latter are in a predetermined position of registration, a spring biased upset lever also pivotally mounted on the lever retaining plate and having a portion engageable with the tumbler disc notches to turn and upset the same when the bolt is moved from its retracted to its extended position, a key-receiving cylinder plug independently rotatably housed within said knob and turnable upon the insertion therein of a proper key, and a member Within the casing and connected to the cylinder plug to turn therewith and engageable with a portion of the lock bolt extension to reciprocate the bolt to a retracted position when the plug is turned through an inserted key.

References Cited by the Examiner UNITED STATES PATENTS 2,023,742 12/ North 285 2,08 1,123 5/37 Stone 70--3 15 2,167,205 7/ 39 Heyer 70285 2,424,396 7/47 Heyer 70285 3,031,877 5/62 Foote et al 70-315 ALBERT H. KAMPE, Primary Examiner. 

9. A COMBINATION LOCK COMPRISING, A LOCK CASING HAVING AN OPENING THEREIN, A LOCK BOLT RECIPROCALLY MOUNTED THROUGH THE CASING OPENING AND HAVING AN INTEGRAL PORTION EXTENDED INTO THE CASING, A SPRING REACTING AGAINST A PORTION OF THE LOCK BOLT TO YIELDINGLY URGE IT TOWARD ITS PROJECTED POSITION, A PLURALITY OF SUPERIMPOSED TUMBLER DISCS ROTATABLY MOUNTED WITHIN THE CASING AND FORMED WITH REGISTERING GATES, CERTAIN OF THE DISCS HAVING NOTCHED PERIPHERAL PORTIONS, MEANS INCLUDING A KNOB FOR TURNING SAID DISCS TO A PREDETERMINED POSITION WHEREIN THEIR GATES ARE IN REGISTRATION, A LEVER RETAINING PLATE CARRIED BY THE EXTENDED PORTION OF THE LOCK BOLT TO YIELDINGLY RECIPROCATE THEREWITH, A SPRING BIASED DRIVE LEVER PIVOTALLY MOUNTED ON SAID LEVER RETAINING PLATE AND HAVING A PORTION ENGAGEABLE WITH THE GATES OF THE TUMBLER DISCS WHEN THE LATTER ARE IN A PREDETERMINED POSITION OF REGISTRATION, A SPRING BIASED UPSET LEVER ALSO PIVOTALLY MOUNTED ON THE LEVER RETAINING PLATE AND HAVING A PORTION ENGAGEABLE WITH THE TUMBLER DISC NOTCHES TO TURN AND UPSET THE SAME WHEN THE BOLT IS MOVED FROM ITS RETRACTED TO ITS EXTENDED POSITION, A KEY-RECEIVING 